1. How Our Body Eliminates Wastes
The Excretory System
How Our Body Eliminates Wastes

2. Excretory System
The excretory system is the system of an organism's body that performs the function of excretion, the bodily process of discharging wastes.
Excretory System – removes excess water, H2O, urea, carbon dioxide, CO2, and other wastes from our blood.

3. Excretory System Kidneys – filter out excess water and urea
Lungs – filter out carbon dioxide, CO2, from the blood.
Skin – excretes water, as sweat, which contains some trace chemical wastes, including urea.

4. I. The Kidneys
Every drop of blood in your body is filtered by your kidneys more than 300 times per day!
Kidneys eliminate urea, minerals and excess water.
Kidneys regulate the amount of water we need to maintain in our bodies.

5. Kidneys – filter wastes and excess water from the blood.
Ureters – tubes that take urine from the kidney to the urinary bladder.
Urinary Bladder – a sack that stores urine.
Urethra – small tube that leads urine out of the body.

7. II. Signs of Disease Doctors analyze urine for disease;
Normal urine contains water, urea and trace minerals.
Sugar in urine indicates Diabetes
Protein in urine indicates the kidneys are not working and the person, or animal, is very sick.